The folks at Y Combinator have seen a lot startups succeed and fail, so it’s probably worth listening to their advice if you’re launching your own company.

The renowned Silicon Valley accelerator published a blog post on Monday written by YC partners Geoff Ralston and Michael Seibel outlining “the most important, most transformative advice for startups” as deemed by YC.

The advice is a must-read for entrepreneurs. It ranges from launching your product quickly; not scaling too fast; raising investment; the 90/10 solution; removing distractions; learning to grow; measuring success; and more.

YC has funded nearly 1,500 startups since 2005 that have a total combined valuation of $80 billion. It has backed several Seattle-based companies; more recently, startups like Poppy, Deako, BloomAPI graduated from the program.

YC has put out similar tips for entrepreneurs like the Startup Playbook written by YC founder Sam Altman. Here’s the “pocket guide” version of YC’s “essential advice”:

Launch now

Build something people want

Do things that don’t scale

Find the 90 / 10 solution

Find 10-100 customers who love your product

All startups are badly broken at some point

Write code – talk to users

“It’s not your money”

Growth is the result of a great product not the precursor

Don’t scale your team/product until you have built something people want

Valuation is not equal to success or even probability of success

Avoid long negotiated deals with big customers if you can

Avoid big company corporate development queries – they will only waste time